| | PCI Express - Free net encyclopedia |
 | | PCI Express, or PCIe, (formerly known as 3GIO for 3rd Generation I/O, not to be mistaken for PCI-X or PXI) is an implementation of the PCI computer bus that uses existing PCI programming concepts, but bases it on a completely different and much faster serial physical-layer communications protocol. |
 | | At the physical level, PCI Express utilizes the very common 8B/10B encoding scheme to ensure that strings of consecutive ones or consecutive zeros are limited in length, so that the receiver does not lose track of where the bit edges are. |
 | | PCI Express implements split transactions (transactions with request and response separated by time), allowing the link to carry other traffic while the target device gathers data for the response. |
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